Mention the main causes for water pollution.
Causes of water pollutions are : $(i)$ Pathogens
$(ii)$ Organic wastes
$(iii)$ Chemical pollutants.
Mention two ways to prevent and rain.
Have you ever observed any water pollution in your area? What measures would you suggest to control it?
Polar stratospheric clouds facilitate the formation of …. .
What is acid rain ? Give the name of the gases responsible for the acid rain.
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